Mitsuyo Maeda

jiu jitsuThe copy below is from Wikipedia:

His Influence on the Creation of Brazilian Jiu Jitsu

Maeda immigrated to Belem, Brazil in the 1910s, where a local influential businessman named Gastafo Gracie helped him get established. In return for his aid, Maeda shared his knowledge of martial arts, which he referred to as jujutsu, with Gastafo’s son Carlos, who then passed it on to his brothers, including Helio Gracie. Together, the brothers would found the system of grappling known as Brazilian jiu-jitsu.

Being small and lacking in physical strength, Helio Gracie was forced to improvise heavily upon Maeda’s teachings. Ultimately, this would give rise to what Helio’s son, Rorion Gracie, trademarked as Gracie Jiu Jitsu. However, Carlos and his son, Carlson Gracie both referred often to Maeda’s teachings both on the phases of combat and closing the distance in order to make use of grappling, such that it has become an integral part of their own style of Brazilian jiu-jitsu.

It is not clearly known why Maeda chose to call his style of judo, Jujutsu. One accepted theory states that Judo wasn’t so popular at those times and the ancient, general and established term for defining Japanese martial-art schools was Jujutsu (in Brazil it adopted the slightly different spelling Jiu-Jitsu). Judo itself was considered a school of Jujutsu (Kano school, or Kano Ryu), as attests the famous Jujutsu contest between the greatest Kodokan judoka and jujutsu masters all around Japan, held in June 11, 1886 at the Shiba Park’s Yayoi shrine. Being just another school of Jujustu, Judo and Jujustu were considered interchangeable terms in the past.